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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aa243e6c2f5fb2ec71d6124eb2fc9219febd3271415d419c36a9bd8354a4f0' 
  AND token = 'JyhrLfx8lVrqPEs/u09mgJXTuO0Y3F4iOzvNamOc45Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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