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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884607125fa90a185742bf27617f5195836dc8116dd5a48878ddf48ddda42a42' 
  AND token = '3xeyljxyNadkQQHKLO8HGv/uXCvrHfy/2bxcDZ6Gau4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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