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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef4a0e9fea6e406769407f1e28229a1aeaf6fa1e912ef6e99ee8c31ae44eb00' 
  AND token = 'Zo0cOVEADrtg8yvY+6nUk2GjohXev/XC0WuzXVp6rKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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