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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129999aec90d72b75f40ae7fc53050c4af335da1c85a5273206c6c9736c1262e' 
  AND token = 'Pqw7pz5K39000nSGQVA8J7ygmvxgsviYXtHYnKk4elM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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