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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b795baf3fefa1893c5c8af028885b46e5cc01ce8b7017831c33a8141d6ad25' 
  AND token = 'EEPxlF9xncfhtMukZXmp1xVSLL7WMlf8CQCwD241PmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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