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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad06a8607db39a2f1844ea0f08139603660e45263cab3893ccd1517e87e07ed' 
  AND token = 'ktOyV5AuWPGXfmpDrch48P/kGOMUnDWl4d9rlqJBOzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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