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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d303747e2b3ffa7552aa74fc13733965596965c4d54d6efdd854e672576639d' 
  AND token = 'XyATPYvDSC/o/zTiq4/QApEHUqtGJZ9lfl7AfENWTLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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