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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a0b4510ba2d93fc55973d050db25a8f9d10e4cc79e0ce3c55b30df104b8c92' 
  AND token = 'ePfKS0ib2153Sev5HQCSZ0yPwjprRS07tPDrDJihbeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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