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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98fc510241a51b5bd39c1515cd9b0e565ed760358a94cd46bbf1473bac5ddef' 
  AND token = 'TSTO6sM5aagMfpmxqssoC0L0YUCVG1loBZCosoOdKu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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