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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff51ce7b2f3df48347c09513f7a243537ebcfd38ec93573f339d2773aa1ef38c' 
  AND token = '9tFjcqP1Ne+caxOrSqjshKd1m3wjLDfELUYNbtXCS4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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