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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe16bb70f0cd90a0108570029563741b55ca10a058d877bf54e0f91fe921346a' 
  AND token = 'ujRKx1wrtMSH72o4mN6vecmgGGuVr3QkYkVOGY3JTlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}