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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed2c76b3a6a982640ff31e6c9f56959e69009127192981fb2e53dca4a386d9c' 
  AND token = 'adXdPgfrkbr7nzBBpsk4Zwls75ZiwMIp0JQc0o69LYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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