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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad73796e976f49298ced6ee6981dded574982c643aa36682ad40490af5e01e5a' 
  AND token = 'L/lpca7Zi+KY+7VO8DTF2IoVPuXuMTUwBHPxeq/9DhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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