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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bba1f2e85a7fb08e993e616410ee4119e6d80ad53b52a08d13c3db10bffa891' 
  AND token = 'xFDoS9tFXDUk3qFQz68cfDmGifRpHBTBVrO7DL9Y4G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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