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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae464c02662cec9e5600a029f7dcc2a6adfde9183d65d045074f31807678e7d' 
  AND token = '/rXi9Eec664K3qpCDNM7AdZpeJj86cvI9JKmJ0h6X/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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