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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cd4c29acbc22a1a4bce7364e9dcda1fce413001bf7e39637e095e3988c0cd8' 
  AND token = 'z5c9ikV4H5EP21VYI94eHsU9rTH7/calHKZogkr2bTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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