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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d87f7eef2636569f14946ab51db2e90848d6373cd5ba0621dedfaef35817206' 
  AND token = 'OKeu+V0nFoWs+SIi+VleddedyIQW4mx+OoUwo4KwpUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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