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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0a29586aa3f8a6994249acda6571842bf6813433ca5eea9a0d7a4559b24467' 
  AND token = 'qtzaOJjbMFK/jalSN0mflthz6hL7UsIGCrf2hQqtGlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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