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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92e2c857dbdff2f59c5dec0118a0c010ff20ae8ddb416606468f8343c23844a' 
  AND token = 'ZF8kP8PMa4g76nio1KedclP9gnlHGKTc9neNiLAHj+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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