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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac1d49b8f6052287cece45c3d351b0a5dec98077803d21cbeff3515a477a632' 
  AND token = 'WJh2LlWFuPNXRRrp34EM1b67V96h8ik4Q3T+i0i+jes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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