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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bd67485176be7a678cd9040c3367b3aa76927101897b9ce29830fa9fee7a87' 
  AND token = 'n59fSckKhm6RvClwIc+x0xq1bAq2RtroYMydwz8L8DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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