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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68e9e1407bd5747419416fd804bc625851849e10f4611cdcb47875a08a2f6aa' 
  AND token = 'iveU+x7jPSka157+ep2pg1GAT6n8hfP7ZhdmiyxK5lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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