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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8207929d287e291aeeefe5a6fb13b5e80599eba90b68e65a4b7cad26005527' 
  AND token = '/roWb/CTDhGKthytjWlGkvgm5Y/STXJH54ctYPiF8Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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