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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516d4efc73de079681ac5ba6e543952dd63e4c316dd106ea8dc6bbc4b9e10b3a' 
  AND token = 'BsxClTHCCunt3zm5iLuyy+GYZomQpENv7r4G1A04W7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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