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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad8f1d2cdf9da4703530d86c2b6c5f16c3f9fdc73e0fbe37d626171bedb6827' 
  AND token = '3Ve1To2EQmXlkONlw4KveBG45tTp54Nlhg5QFbxwySE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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