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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fe4e1932c07b186712f1940af09ca445bc3335105a24794492806bfc2bfb98' 
  AND token = 'sIqOmz3z9ddmk+LaCYl+72uHlB0F5jwY3ygdlq1sl8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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