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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6d1f6ff3ca9f539467338f0e9d772fc437239306e17662ab790c2c25d39df3' 
  AND token = '7RvJnUWEUeROHo9WuYiJRisgu5BTtyXbW7e08DLyrMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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