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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3d962a487b1f9d4c7bd6612f49cb55ac27e0dd3a198a9469d4af182237b81d' 
  AND token = '1U69ekpIdFE31N/hY/EZtd/0UzZ8mVavQBkerOJlxpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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