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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ea83d1affe8a57c24868eb142527c1fa335fe28a740c8e6ea25f1a7fd1d1a6' 
  AND token = 'nmuKKRZCeX4nzbC9TFCTi/ggA58w41zPvlbssEAb8PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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