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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821479f4f5dd592f5293460c49fafa436b7a3e160d6a2a8e372dcb7a3f6cab3a' 
  AND token = 'vMd02wFEW5f9fpevUmukvhR0Gw+Z1yHcl8Rys8LE7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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