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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e309830cfe066f1801c2fe635a9fe698beee0c8c345e289ca24fb7282edd32' 
  AND token = 'Jzzupt3SlsGA5Mg2sNkCXmx0QQm3W54DSPpf0brM7FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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