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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71727918c66f4b0538ab45cc717d8efa74dbef152c8d6c607426ae3db80b761' 
  AND token = 'oDFGKZAaVXZmIe7JAyiHKzS5ufypo4/bD7j8ylpicgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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