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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56aa18a5437e44567af245a3da1737e998ba6ee02396027147a0e1f3d7fdc5d0' 
  AND token = '7lJLDSsjtuydoGSc1TaJBGfqM2aQAVgZLve+HkfUSbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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