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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb552e53975ac57f9daff9a92a2df5a1dad1b6e74a5df44740e4b71112c0631' 
  AND token = 'hcOaxq6WrXONHNcITE+XpjoGxRPKSx7938OvFZ/ubFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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