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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadc4ef04e4b9787856da5a0894760da3c48fad163c767535b90642ba35f6cac' 
  AND token = 'bQG5XOh58TESK4HmZnTX/l23y6YubnkwYSSII6k/40U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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