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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92aab5defec177d33ee18a32937a65f4cefdda5b0d0c2f26738960be792b9a58' 
  AND token = 'ATr4xcge39ohg2jfiSD9hzRJjOBkb5detBGMwW4Z6mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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