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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8919e1f848e0bd8390c11138501d5a6aa1cf1cfe4b13328309d3872070e3e29' 
  AND token = 'CcxAf+GB059fk8nZRZUAAg2Bt9mOtRnaySZbUUfchJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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