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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3416f5dbe0e771e3e9be9643d10ae5dac576f6dd7f987ea9177b13ce00ff7138' 
  AND token = 'o56iE/oLO1PcvQOf54GAkAfkGcf4mChDVrn0mlp6B8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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