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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175ec51b41d78b570012ad50bcbcba0b5c711410cc6f1cbf74a0178ac031672f' 
  AND token = 'Sto2Q62ecGGTPqOIGqq7qNZOaCqZ9jDZfhGo3z8olxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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