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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eb18ac89d429429806ad8a384749bed77b0833de4bbdd18bcdab95b2e1a62a' 
  AND token = 'I88Iy7KjvTj+ujDj4oEm0pxbgW+25Ycz1WOqABlS39E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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