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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4341f11ec3ce702bb4f6bcc26fd72f0b0a764d05cf689209b24e534ff07ef19c' 
  AND token = '/XYz2NdzjU/vQZ+GxYNBd4lsGuNrO0pGtW86ceRnmmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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