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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a865661af694eb3c5af55033424f1aca14fbb124ef5a93e06cab3160f095dae0' 
  AND token = 'daGdXflsruJWsjqdNjD3ExGtH3Rtl0eld357qORNoRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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