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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ac2bf507a0bb16a9c1a4e996f942ab7dd8bdfc3f8ec466d77b93d2019cc70c' 
  AND token = 'PrOUY3AYedScCkFjUpaDwJ3MK8paIc2TIimmWnrISjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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