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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd98105d73399aa86e7867d300ada2e2462db22f786684cecf5e33ef1db0f100' 
  AND token = 'b3HoSbNI0BE6VVy64Rkrs8HFfbiAid8AfJ/3Ph+Q6Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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