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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59e795609a78ff9cd20e622230e8800a4e0ba1f0b919d830f64e009dba05ab53' 
  AND token = 'QjXGef3T4RDZeMjYmGDCPqSALirEyoSnJt6FNPqSqZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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