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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72451dc48429b7591e3a4a8f39d01d8eea36922b7e07e3ff404fdc5e9b94ad7' 
  AND token = 'DMeZU+7SqCHV5bJzKrQ2gGnWhkEoXbUhejoSfdH/x8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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