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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeff2872806abe77350a8accf8d02ea2ee5edbb10d882f5a8826451f08f8dbfc' 
  AND token = 'SEY5uAohnGiW9GNtgFiBrspeMlk9bU0Ps8uHaTXGlEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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