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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46242505eec805d4d840d518d0f78c3752c9d5431085e4bf130148b231e8010' 
  AND token = 'oIG7m1kfgHlm9EPNTgPo2PDzCe8OgiIrjCBSYD0UoHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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