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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90903c7f27d86d586e9121707631ccc7e368f706dd5887a1aa8741d925f13d54' 
  AND token = 'TyGQZx2PKag766s3dvdyv0EjnnCdWUNPGjRv2uFniAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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