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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d2fbb5b6b9200b262e4f7b5e4eefde85c5f7faeb6e81e20c705bb871f7c461' 
  AND token = 'hFclaPiDmg/cFxs22XUrxkfvywYO5fDSk63jsMksR/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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