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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca937c2594b74b7cd79e0003ee1273663f8a1406c46ffca6ab56f3e24d25f60e' 
  AND token = 'SZp1oCr3jcVxR3MwHGlyomJQkWI/5RqTMacMpOUyW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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