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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734ea70711d6115dc2d39ab8ad4b9975e68cdf52e63497b23a57b3575850caa4' 
  AND token = 'Qdh+qbzAmc/libqu4MsjBzziBWDNoOuDSC292ex54q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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