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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca52a2f425e2c2f6ef55ac6dfa7b4783abd21d98cd207932e525b136855ac30' 
  AND token = '0I6UB8wVyuJQD9nPFpIzDibvv+en3zKMqDCSqyT0t58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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