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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13aeb614c3954c24a0f171deba38f9f7378eeb244753b58af3dd81675cbda14a' 
  AND token = '4m8F7V5/Bl+0ZIGR4bdIyEAKXE+Sk8K9LJMf6b9ZFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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