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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b83e12b030e9717c60cccdb22daa30bde1aa3b6c0e668edd286dc27c450ad88' 
  AND token = 'tWP4YUt2eT3RtIXwedgzrT/u2hiLmSBSJLYSdAmmybU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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