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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3150195df0aa5703655763ab9ed7f1c857f33252b56f8b758733966299bf089d' 
  AND token = '1q5h9sdu2jxbtGgJYOGDyF83RzbG5gn4s4EcS2B12IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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