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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7333f095474a109c80b32be9d4ca87a28c17226d7128b7491c9658c8cc8b088e' 
  AND token = '0nlx5OukeorCG238manLnlHn74zVu1XxPiXTurluM6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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