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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e072445eeeb04f4b6f81c59b4d5a4a0f4ac12c3a1a7370075e6839cdd3c6cecd' 
  AND token = 'vMyKS3o1KraDcQekcWqDM6HpC5A3TRWnIh5vA+C6X68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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