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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68022f07d035cf25b6c0236047270d3356ed5be9f021a31936ebf4c9264061b8' 
  AND token = 'wi8QSKCViRLPT69ZR9w2kuLfpLKxDO3055+wbx/5q3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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